Safety plate-holder for electrotype and stereotype shaving machines



C. N. SMITH. sum PLATE woman FOR ELECTROTYPE AND STEREOTYPE SHAVING MACHINES.

APPLICATION FILED JULY 29,19l8- 1,349,736, 7 Patented Aug. 17, 1920.

2 SHEETS-SHEET I.

xvi 151v TOR.

1w inass" Y C.- N. SMITH.- SAFETY PLA HQLDERFOR'EEECTROTYPEAND-STEHEOTYPE SHAVING MACHINES.

rue-Anon mid JULY 29. ms.

Patented Aug. 17, 1920.

2 SHEETS-SHEET 2- N ENTOR.

Mhfmilf UNITED STATES PATENT OFFlCE.

CHRISTIAN N. SMITH, 0F ELGIN', ILLINOIS.

Specification of Letters Patent.

Patented An". 17, 1920.

Application filed July 29, 1918. Serial No. 247,277.

To all whom it may com-cm Be it known that l, Ui-inis'rian N. SMITH, a citizen of the United States, residing in Elgin, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in @afety Plate-Holders for l llectrotype and titereotype Shaving Machines, of which the following is a specification.

This invention relates to plate-holders for electrotype and stereotype shavlng machines, ano particularly to plate-holder attachments which are adapted to be attached to or mounted upon machines for shaving electrotype or stereotype plates, or other or similar metallic plates to be shaved or planed.

The principal object of the invention is to provide simple, economical and eiiicient safety plate-holder for machines for shaving or planing electrotype or stereotype plates or other or similar metallic plates, and an improved plate-shaving machine.

Other and further ob 'ects of the invention will. appear from an exami ation of the following description and claims, and from an inspection of the accompanying drawings, which are made a part hereof.

The invention consists in the features, combinations, parts, and details of construction herein described and claimed.

, in the acconnganyingr drawings, Figure l is a view in side, elevation of my improved plate-holder, showing the same attached to an electrotype andistcreotype shaving, machine niado in accordance with my invention, with parts of the sl'iaving; machine broken away;

ll 2 is a plan view of the plate-holder attachment or (llQVlCG shown in Fig. 1, showing: the same in position upon the type of elmtrotype and stereotype shaving machine shown in l' ig. 1, with parts of the shaving machine broken away or omitted;

Fig. 3 is a view in side elevation of my improved plate-holder attachment, with parts broken away, showing the same attached to and adapted to operate in connection with a diifcrent form of stereotype and electrotype shaving machine from that shown in Figs. 1 and the machine shown in Fig. 3 being; of well known form; and

Fl, 4, shows a pivoted safety-plate holder of mo lied ii'orm, in perspective, adapted to be attached to anyordinary shaving); machine.

In providing an electrotypo and stereotype shaving machine with a plate-holder attachment constructed in accordance with my invention, I provide an electrotype and stereotype shaving or planing machine 1 having a platesupporting bed 23 mounted upon a suitable supporting; frame com nrisinglegs 3, longitudinal frame members 4: and transverse f1 ame members 5, and having the usual receptacle or container for recelving shavings and waste material.

movable knife-supporting head, cutter head or carriage '7 is mounted in slid-able engagement with the side frame members 4; and in position to extend transversely across the plate-supportingbed 2, being slid-ably connected with the frame by means of car riag'e end-frame members 8 which are supported upon and in slidable engagement with the side-frame members 4: of the stationary main frame, the carriage frame members 8 being provided with bottom jaws or flanges 9 which extend bone: th and in sliding eiumgement with side frame members l located on opposite sides of the bed or forming); the side margins of the bed. The and frame members 8 of the horizontally movable knife-supporting head or carriage are connected by means of a transverse carriage frame member 10, 01? other suitable connecting means adapted to connect the end-frame members of the carriage in such a manner as to form a strong and suitable supporting frame, carriage or head for supporting and guiding the knife in the operation of shaving: or planing stereotype or electrotypc or similar metallic plates laid upon thobed in position to be operated upon. A knife 11 is mounted in or SllpDOlliMl by the carriage or knifesupporting head in any desired ordinary and well known manner; and suitable means is provided for driving and rwersing the direction of move ment of the kmyc-supporting: head or carriage. In the plate-holder and improved form of electrotype and stereotype shaving machine shown in Figs. 1 and of the drawings, the knife or cutter blade 11 is adjustably supported upon a pivoted sup 'iortintg plate or rear clamping member 12 fixed to an axle 13, the opposite ends of which are jonrnaled in the end-frame members 8 of the cutter-head or carriage; and a front knife-engaging clamping member or plate 14: is secured in clamping); engagement with the forward upper side of the knife by main drive shaft.

of the knife, and having lock nuts 1'? thereon, are adapted to enable the knife to be ad usted and secured 1n the desired position between the jaws. Crank arms 18,

'fiXGCl to opposite ends of the rock-shaft l3 engage corresponding ends of a roller 19 which has its opposite end portions mounted in upwardly and dowlnvardly movable sliding blocks 20 mounted between vertical guides or ways 21 and provided with springs 22, adjusting screws 28 and adjusting nuts 24 for holding the sliding blocks 20 and roller 19 in any position in which they are adapted to be adjusted. Springs 25 connected with the crank arms 18, serve to hold said arms yieldingly in engagement with the roller 19, and to permit the same to be raised against the tension of said springs so as to raise the bottom ends of the crank arms and thereby lift the cutting edge of the knife from its lowered cutting position. The knife-supporting head or carriage is provided with rearwardly extending toothed racks 26 which are operatively connected with a main driving shaft 27 by means of a counter-shaft 28 having toothed pinions 29 fixed thereto and in toothed engagement with the racks 26, a spur gear wheel 30 being fixed t0 the rotative counter-shaft 2S and in toothed engagement with a spur pinion 31 fixed to the main drive shaft 27. The main drive shaft 27 is provided with one or more belt pulleys or drive wheels 32 mounted in concentric relation to the I prefer to employ two drive wheels 32 in the form of belt pulley wheels each adapted to be connected with a motor or source of power so as to rotate in opposite directions when in operation. And

the main drive shaft is provided with suitable clutch mechanism-notshownwhich maybe of any ordinary and well known or suitable form adapted to operatively connect the shaft with the drive wheel mechanism in such a manner that the shaft may be rotated'in opposite directions successively, as desired, so as to cause the knife-supporting carriage to travel over the plate-supporting bed, and over any plate thereon, in opposite directions. Trip-supporting rods 33 are mounted in stationary supports 31 on'opposite sides of the main frame of the machine and bed. Each of these rods is provided with a rear tripping member or de tent 35 near one extremity of the bed and a forward. tripping finger or detent 36 near the other or forward extremity of the bed, but

both adjustably secured to the rods on which they are mounted. Slidable roller-supporting and tripping members 37 are slidably mounted on the carriage on opposite sides of the bed and in supporting engagement with the opposite ends of the roller 19, when the latter is in raised position-the roller being supported by the sliding blocks in which it is journaled, in position to be pressed down against the upper surface of a. plate so as to travel over the plate in advance of the knife, but out of engagement with the crank arms 18 when said roller and the knife edge are in lowered operative position. The tripping members 37 on the carriage are in position to travel back and forth between the tripping members 35 and 3G, and are slidably supported on the carriage by bolts 38 in elongated, slots 39, and have raised roller-supporting cam portions 11. adapted to engage and support the roller 19 in raised position. Depending shoulders 41) on the members 37 are adapted to be engaged by the tripping fingers and 36 so as to cause the raised bossesl to engage and raise the roller 19 and thereby raise the knife when the carriage and knife have reached their forward limit of movement and the shoulders 410 are engaged by the correspomling tripping fingers 36 at or near the forward extremity of the bed. The knife is thus permitted to return to its starting point with its edge raised above and out of engagement with the plate to be operated upon, until the depending tripping shoulders 40 come into engagement with the rear tripping fingers 35, thus operating the roller-supporting members 37 and permitting the roller 19 to be lowered into engagement with the top surface of the plate to be operated on, and out of supporting engagement with the crank or lever arms 18 fixed to the pivoted knife-supporting member 12.

A pedal 13 is ooeratively connectm'l with the clutch mechanism of the main drive shaft in any ordinary or suitable known manner, so as to cause the carriage to be moved forwardly when that pedal is operated; and a pedal elf is in like manner operatively connected with the clutch mechanism so as to cause the main driving shaft to be operated in a reversed direction and cause the carriage and knife to be moved rearward or to initial position. The clutch mechanism and pedal connections may be of any ordinary known or suitable form. and it is not deemed necessary or desirable to further describe or show the same herein.

My preferred form of pivoted safety plate-holder suitable for use in connection with and forming a part of my improved electrotype and stereotype shaving machine herein described and shown, and also adapted to be used with any ordinary and well known form of electrotype and stereoand downwardly movable bearing blocks 46 which are slidably mounted between vertical guides or ways 47 on the end frames 8 at the opposite ends of the knife-supporting head or carriage. Compressible springs 48 are interposed between the tops of these bearingblocks and adjacent retaining plates 49, so as to tend to press the bearing blocks downward and permit but yieldingly resist any upward movement of the rock shaft which is necessary or desirable in order to enable the device to operate eliiciently when employed in the operation of shaving or' planing plates of varying thickness. To this rock shaft is fixed an angular lever arm 50 the main body portion of which is adapted to extend longitudinally of the bed and machine frame and horizontally over and parallel with respect to the top surface of the bed and top surface of any electrotype or stereotype plate or other metallic plate to be operated upon, when the lever arm is in lowered horizontal position, as shown in full lines in Fig. l. The lever arm has a relatively short angular end portion 51 at its rear or pivoted extremity, adapted to extend downward from the rock shaft and in substantially perpendicular relation to the horizontal bed and main body portion of the lever arm, when the arm is in lowered operative position. At the bottom of this perpendicular or depending angular portion 51 of the lever 50 is mounted a roller 52 which is rotatively supported by means of an axle 53 which is mounted upon said lever in position to extend transversely with re spect to and movable to raised and lowered positions with said lever. This roller is disposed transversely with respect to and adapted to travel over the bed in advance of the knife and in contact with the top surface of any electrotype or stereotype plate or other metallic plate laid flat upon the bed, to be operated. upon or shaved or planed. The roller 52 is, by preference, thus rotatively supported upon the lever in a position slightly back of the axial center of the rock shaft 45, or axis of the lever 50, but beneath said rock-shaft and in advance of the cutting edge of the knife, when the lever is in lowered or horizontal operative position.

A series of parallel plate-engaging transverse rollers 54 are rotatively supported upon and in position to extend laterally on opposite sides of the main body of the lever 50 by means of a series of parallel axles or transverse roller-supporting rods 55 each of which is mounted upon, and, by preference, in position to extend transversely with respect to and on opposite sides of the main body of said lever, so that each axle or rod 55 is adapted to rotatively support a pair of rollers 54 located on opposite sides of the lever or roller-supporting arm 50. The rollers are retained in rotative position upon the axles or rods 55 by means of retaining nuts 56 which are in threaded engagement with the outer ends of the rods and adapted to engage the adjacent outer ends of the rollers upon said rods. The rods may be secured in fixed relation to the lever 50 by means of retaining screws 57 each of which engages a central portion of the rod to be held in place thereby. These transverse rollers are thus supported in parallel relation to each other and all in the same plane Y with each other and in the same plane with the longitudinal center of the lever 50, but in such position that the bottom surfaces of the rollers will all be in the same horizontal plane with each other but sufficiently below the level of the bottom of the lever 50, when the latter is in lowered horizontal position, so that the bottom faces of the rollers will engage the top surface of any electrotype plate or stereotype plate or other metallic plate laid flat upon the bed, to be operated upon or shaved or planed.

In Fig. 3, is shown another ordinary and well known form of electrotype and stereotype shaving machine, with parts broken away or omitted, only such parts being shown as are deemed necessary in order to enable the invention to be made, used and understood by those skilled in the art. In the form of machine illustrated in Fig. 3, a knife-supporting head or carriage 58 is slidably mounted in position to extend transversely across and over and to be moved back and forth lengthwise of a stationary plate-supporting bed 59, which is supported by a machine frame which may be of any desired ordinary and well known or suitable form. The knife-supporting head or carriage 58 has a knife 60 mounted thereon in position to extendtransversely with respect to the plate-supporting bed and transversely with respect to the direction of movement of said knife-supporting head or carriage, the bottom edge of the blade being horizontal and adapted to en gage and shave the top side of any electro type or stereotype plate or other similar metallic plate 60 laid upon the bed in horizontal position, to be operated upon. The knife 60 is secured in operative position upon the knife supporting head or carriage, by means of a plate or knife clamping aw 61 and headed securing screws 62 which are in threaded engagement with the head, and adapted to hold the plate or clamping jaw (il in securing engagement with the knife or blade.

The knife-supporting head or carriage 58 is operatively connected with a suitable source of power in the usual manner: Si pair of horizontal toothed racks G2 are fixed to the carriage 58 in position to travel lengthwise of the plate-supporting bed on opposite sides of its longitudinal center. A main driving shaft 63 is rotatively sup ported in suitable hearings. in the machine frame; and a counter-shaft G4, rotatively mounted in suitable bearings, is provided with spur pinions 65 fixed thereto and each in toothed engagement with a corresponding toothed rack 62. A spur gear wheel 66 is fixed to theshatt G l and in toothed engagement with a spur pinion 6T fixed to the main driving shaft 63. A main driving wheel or beltpulley 68 is mounted in concentric relation to the main driving shaft, and adapted to be operatively connected with and disconnected from operative engagement with the main driving shaft by any desired ordinary and well known form of clutch mechanism suitable for the purpose. Such clutch mechanisms being in common use and well known in the art, it is not deemed necessary or desirable to describe the same ierein.

' In providing an electrotype and stereotype sharing machine of the kind shown in 3, with an improved safety plateholder device or attachment constructed in accordance with my invention, I mount one or more angular bracket members 69 upon the traveling lmife-supporting head or carriage 58'. The bracket or bracket members comprise one or more upright angular arm portions 70 whichare secured to the back of the knife-supporting head or carriage by means of suitable securing screws 71, or other ordinary suitable securing means; and

horizontal bracket arms 72 extend forward from the upper extremity of the upright bracket portions 70'with which they are connected so as to form one integral piece, if desired. The forwardly extending bracket arms 72 are located at or near 0pposite ends of the knife-supporting head or carriage, with their forward ends in advance of the knife and in position to form suitable means for supporting the rockshaft and rollers and pivoted lever mechanism of my improved plate-holder device or attachment in operative position upon the knife-supporting head or carriage.

The rock shaft 45 of my improved plateholder attachment is adapted to be supported at its opposite .ends by means of the forwardly extending bracket arms 72, so as to form a rocking or pivotal support for the roller-supporting arm 50 and the parallel rollers 52 and .54 which are mounted upon said roller-supporting arm or lever. The rock-shaft 4L5 may be provided at its opposite ends with suitable bearings which may be in the form of upwardly and downwardly ,1 and movable sliding bearing blocks in each slidably mounted in a socket or slot formed by a supporting member 73 secured to the end of the corresponding bracket arm T2; and compressible springs i8 may be interposed between the tops of these bearing blocks and.

' in broken lines in said figures.

From the foregoing description it is plain that my improved plate-holder device or attachment, including the rock shalt -45. (hc roller-supporting arm or lever member .711, with l 3 depending angular portion 51. and the rollers 52 and and their supporting axles or rods 55, all constructed and arranged as described in connection with Figs. 1 and 2 of the drawings, is adapted to be attached to the knife-supporting head or carriage o'l an electrotype or stereotype plate shaving machine of the form shown in Fig. :3. or any ordinary and well known form ofstcrcolypc or electrot pe plate shaving machine. and the device so constructed is shown in Fig. 2). attached to an electrotype and stereotype shaving or planing machine oi the simple form in which the knife is not adapted to be automatically raised and lowered. as it is in the form of machine shown in 1 and 2.

In operation the plate to be shared or planed is placed in liat horizontal position upon the bed, by the operator. The rollersupporting arm or lever 50 is then lowcrcd from the position in which it indicated in broken lines in Fig. 3, to its lowered horizontal position as shown in full lines in Figs. Pedal 43 is then pressed down so as to cause the kniic-supporting head or carriage to travel in a torward direction over the plate to be shaved. ll'hcn the knifesupporting head, with its knife in position to engage the plate to be operated upon. has reached its forward limit of movement. the pedal i lis pressed so as to cause the driving mechanism to move the kni'lc-supporting head or carriage in the opposite direction, with the parts in position for another cutting' movement. During the cutting moroment of the knits-supporting head or carriage. the operator holds or presses the lover or roller-supporting arm down so as to hold the rollers in engagement with the platc over which the rollers are caused to pass in advance of the knife. The plate is thus firmly and securely held down during the shaving or planing operation, and is prevented from bending, buckling or cracking or from becoming distorted or in any way injured during the shaving or planing operation, regardless of the thickness or site of the plate to be operated upon. The plates, which, in practice are of varying thickness, are thus shaved and rendered of the desired uniform thickness with great facility and in such a manner that great speed of operation is rendered possible without danger of buckling, breaking, distorting or injuring the plates operated upon.

A roller 74; journaled in suitable bearings 75 in supporting brackets 76 at the front end of the machine, is adapted to engage the bottom face of the lever 50 and limit its downward movement when the lever has been carried forward with the knife-supporting carriage.

In the form of safety-plate holder device or attachment shown in Fig. I, the rockshaft 4:5,-which is adapted and intended to be mounted upon the carriage and supported in resilient journal bearings as shown in Figs. 1 and 3,-is provided with an angular plate-holder arm member 77 having a depending angular end portion 7 8 fixed to and extending downward from said rock-shaft; and a plate-engaging member in the form of a flat shoe 7 9 is fixed to the main body portion or plate -holder arm member 77 in position to slidably engage the top surface of a plate laid upon a platesupporting bed, to be operated upon or shaved in the manner already described. The plate 7 9 and plate-holder arm 77 are thus adapted to engage the top surface of a plate to be operated upon, and to travel over such plate in advance of the knife-supporting carriage during the cutting operation, in the manner in which the pivoted arm 50 with its rollers travel over and hold down a plate to be operated upon, as already described. Anti-friction rollers 80 may be rotatively mounted beneath and in parallel relation to and slightly back of the axial center of the rock-shaft 45, and adjacent to andback ofthe rear edge of the shoe member 79, in position to engage a plate to be shaved or operated upon, said rollers being supported by means of an axle or red 81 secured to the lower extremity of the depend ing angular plate-holder arm portion 7 8, and provided with retaining nuts 82 for retaining the rollers in operative position, as shown in Fig. 4. These rollers are thus adapted to be yieldingly held in engagement with the plate to be operated upon, and to travel with the carriage and in advance of the knife.

I claim 1. In an electrotype and stereotype shaving machine, the combination of a platesupporting bed, a knife-supporting carriag extending transversely with respect to and adapted to travel over the bed, a knife mounted on and movable with the carriage in position to engage and shave a plate supported upon the bed, a plate-holder member pivotally connected with the carriage and extending forward in advance of the same and over the bed and acting to operatively engage and hold down a plate supported by the bed and. engaged by the knife, and means for operating the knife-supporting carriage.

2. In an electrotype and stereotype shaving machine, the combination of a plate supporting bed, a knife-supporting carriage extending transversely with respect to and adapted to travel over the bed, a knife mounted on and movable with the carriage over the bed and in position to engage a plate supported by the bed, a plate-holder arm pivotally connected with the carriage and extending forward in advance of the carriage and over the bed, and a plate engaging member supported by said plateholder arm and adapted to engage the top surface of a plate supported by the bed and engaged by the knife, and means for operating the knifesupporting carriage.

In an electrotype and stereotype shaving machine, the combination of a platesupporting bed, a lniife-supporting carriage extending transversely with respect to and adapted to travel over the bed, a knife mounted on and movable with the carriage over the bed and in. position to engage a plate supported upon the bed, a transverse rock-shaft located in front of the knife, re-

silient bearings upon the carriage and in supporting engagement with the rockshaft, a plate-holder arm fixed to and movable with the rock-shaft and extending forward in advance of the carriage and over the bed. and adapted to operatively engage and hold down a plate supported by the bed and engaged by the knife, and means for operating the knife-supporting carriage.

4. In an electrotype and stereotype shaving machine, the combination of a plate supporting bed, a knifesupporting carriage extending transversely with respect to and adapted to travel over the bed, a knife mounted on and pivotally connected with the carriage and adapted, to engage and shave a plate supported upon the bed, crank arm mechanism secured in fixed relation to and adapted to rock with the knife, a roller located forward with respect to the knife and in position to. raise and lower the crank arm mechanism and adapted to engage a plate supported by the bed and engaged by the knife, resilient bearings upon the carriage and in supporting engagement with the roller, a plateholder member pivotally connected with the carriage and extending forward in advance of the carriage and over the bed and adapted to operatively engage ingmachine, the combination of a platesupporting bed, a knife-supporting carriage extending transversely with respect to and adapted to travel over the bed, a knife mounted on and pivotally connected with "10 the carriage and adapted to engage and shave a plate supported upon the bed, crankarm' mechanism secured in fixed relation to and adapted to be rocked to raised and lowered position with the knife, a roller located forward with respect to the knife and in position to engage and raise and lower the crank arm mechanism and adapted to en- 'gage the top surface of a plate supported by the bed, resilient bearings upon the carriage and in supporting engagement .with the roller, means for raising and lowering the roller, and means for reciprocating the carriage.

6; In an electrotype and stereotype shaving'maehine, the combination of a plate- .supporting bed, a knife-supporting carriage extending transversely with respect to and adapted to travel over thebed, a knife mounted on and movable with the carriage in position to engage a plate supported upon the bed, a roller located forward with respect to the knife, resilient bearings on the carriage and in supporting engagement with the roller, and means for lowering '35 and raising the roller into and out of engagement wlth the top surface of a plate supported by the'bed, and means for reciproeating the carriage.

7. In an electrotype and stereotype shav- 40 ing machine, the combination of a platesupporting bed, a knife-supporting carriage extending transversely with respect to and adapted totravel overthebed, a knife mounted upon and movable with the carria ge, for shaving a plate supported upon 'the bed, a roller-supporting arm attached to and movable with the carriage, and transverse roller mechanism rotatively supported 7 upon said arm and movable ith the arm fandcarriage in advance of the knife and in 7 position to engage thetop surfaceof a plate supported by the'bed.

'8'. In an electrotype and stereotype shaving machine, the: combination of a platesupporting bed,'a knife-supporting carriage extending transversely with respect to and 1 adapted to travel over the plate-supporting bed, a knife mounted upon and movable With the carriage, for shaving plates to be supported upon the "bed, aroller-supporting arm having articulate connection with the carriage and adapted to extend in front of the knife, transverse roller mechanism rotatively supported upon said arm and in front of the knife, and movable with the arm and carriage over the plate-supporting bed and in advance of the knife in position to engage the top surface of a plate engaged by the knife and supported by the bed, and means for operating the carriage.

9. In an electrotype and stereotype shaving machine, the combination of a platesupporting bed, a knife-supporting carriage extending transversely with respeet to and adapted to travel over the plate-supporting bed, a knife mounted upon and movable with the carriage, for shaving plates mounted upon the bed, a roller-supporting arm pivotally connected with the carriage in position to extend in front of the knife. transverse axles mounted upon said pivoted arm, rollers rotatively mounted on said axles and in front of the knit and movable with the arm and carriage over the platesupporting bed and in advance of the knife in position to engage the top surface of a plate supported by the bed. and means for operating the knife-supporting carriag 10. In an electrotype and stereotype shaving machine, the combination of a platesupporting bed, a knife-supporting carriage extending transversely with respeet to and adapted to travel over the platesupporting bed, a knife mounted upon and movable with the carriage, for shaving plates mounted upon the bed, a roller-supp wting arm having articulate connection with the (arriage and located in position to extend in front of the knife, transverse axles fixed to and extending laterally on opposite sides of said roller-supporting arm, rollers rotatively mounted on said axles on oppos te sides of said roller-supporting arm and in position to extend in frontof the knife andin engagement with the top surfaee of a plate supported by the bed, and means for operating the knife-supporting carriage.

11. In an electrotype and stmeotypeshaving machine, the combination of a platesupporting bed, a lmife-supporting carriage, extending transversely with respeet to and adapted to travel over the plate-snpporting bed, a knife mounted upon and movable with the carriage, for shaving plates to be supported by the bed, a transverse roekshaft located infront of the knife, resilient journal bearings mounted upon the knifesupporting carriage and in supporting engagement with the rock shaft, :1 roller-supporting arm fixed to the rock shaft and extending forward from the same in front of the knife, transverse axles mounted upon and extending laterally on opposite sides of the roller-supporting arm, rollers rotatively mounted on said axles on opposite sides of said roller-supporting arm in position to extend in front of the knife and in engagement with the top surface of a plate sup ported by the bed, and means for operating the knife-supporting carriage.

liZ-i 12. In an elcctrotype and stereotype shaving machine, the combination of a plate-sup porting bed, a linife-supporting carriage extending transversely With respect to and adapted to travel over the bed, a lrnife mounted upon and movable with the carriage, for shaving plates to be supported by the led, a trai'isverse roclr shaft located in front of the lr: ife, resilient l ear-lugs upon the carriage and in supporting engagement with the rock shaft, a roller-supportin arm lined to the rock shaft and extending downward and forward from the rock shaft and in front of the knife, a roller rotatively mounted upon said arm below and rearward with respect to the axial center of the rock shaft, transverse axles mounted upon and extendii'ig laterally on opposite sides of the rollersupporting arm and in front of said rock shaft, in position to engage the top surface of a plate to be si'ipported by the bed, and means for operating the knife-supporting carriage.

l-tl. In a plate-holder attachment for electrot-3 1M) and stereotype shaving machines, a rollersupporting arm, a series of axles iounted upon. and extending laterally on opposite sides of said arm, rollers rotatively mounted on said axles on opposite sides of and in perpendicular relation to said roller supporting; arm, the axes of said rollers be ing in parallel relation to each other and all in the same plane, a lniife-supporting carriagre, and means for connecting; said rollersupporting arm in articulate relation to the lrnife-supporting carriage and in position to support said rollers in engagement with the top surface of a plate to be shaved.

In a plate-holder attachment for electrotype and stereotype shaving machines, a roller-supporting arm, a series of rollersupporting axles mounted upon and extending laterally on opposite sides of said arm, rollers rotatively mounted 011 said axles on opposite sides of the roller-supporting arm, the axes of said rollers being in parallel re lation to each other and all in the same plane, a rock shaft fixed to one end of said roller-supporting arm and extending laterally on opposite sides of the same, a knife- SUPPOl'hlllg carriage, and means for pivotally connecting said rock shaft with the lmifesupporting carriage and in position to support said arm and rollers in front of such carriage.

15. In a plate-holder attachment for electrotype and stereotype shaving machines, the combination of a roller-supporting arm, a series of roller-supporting axles fixed to and extending laterally on opposite sides of said arm, rollers rotatively mounted on said axles on opposite sides of the roller-supporting arm, the axes of said rollers being in parallel relation to each other and all in the same plane, a rock shaft fixed to one end of said roller-supporting arm and extending laterally on opposite sides of the same, a knife supporting carriage, and resilient bearings upon the opposite ends of said rock shaft and adapted to be supported upon the knife supporting carriage, for pivotally supporting such rock shaft upon such carriag'e.

Signed at Chicago, Illinois, July 18, 1918.

CHRISTIAN N. SMITH. lVitnesses DAVID I l. FLETCHER, W. HARDING. 

